Claims
- 1. A method of preparing an oxide superconducting wire, consisting essentially of the following sequence of steps:
- covering a powder material for forming an oxide superconductor with a metal covering;
- performing deformation processing on said metal-covered powder material to obtain a tape-shaped wire superconductor material;
- superposing a plurality of said tape-shaped wire materials;
- performing a first heat treatment on said plurality of superposed tape-shaped wire materials, wherein said metal coverings are diffusion-bonded to each other during said first heat treatment step;
- performing deformation processing consisting essentially of rolling said plurality of superposed tape-shaped wire materials; and
- performing a second heat treatment on said plurality of deformation-processed tape-shaped wire materials.
- 2. A method of preparing an oxide superconducting wire in accordance with claim 1, wherein said powder material is degassed before said covering step.
- 3. A method of preparing an oxide superconducting wire in accordance with claim 1, wherein said oxide superconductor is a Bi-Sr-Ca-Cu or (Bi, Pb)-Sr-Ca-Cu superconductor having a 2223 composition, and wherein said powder material for forming said oxide superconductor consists of a superconducting phase and non-superconducting phases, and the majority of said superconducting phase consists of a 2212 phase.
- 4. A method of preparing an oxide superconducting wire, consisting essentially of the following sequence of steps:
- covering a powder material for forming an oxide superconductor with a metal covering, wherein said powder material consists of a superconducting phase and non-superconducting phases, and the majority of said superconducting phase consists of a 2212 phase;
- performing deformation processing on said metal-covered powder material to obtain a tape-shaped wire superconductor, wherein said oxide superconductor is a Bi-Sr-Ca-Cu (Bi,Pb)-Sr-Ca-Cu superconductor having a 2223 composition;
- superposing a plurality of said tape-shaped wire materials;
- performing a first heat treatment on said plurality of superposed tape-shaped wire materials, wherein said metal coverings are diffusion-bonded to each other during said first heat treatment step;
- performing deformation processing consisting essentially of rolling said plurality of superposed tape-shaped wire materials; and
- performing a second heat treatment on said plurality of deformation-processed tape-shaped wire materials.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-188495 |
Jul 1990 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 08/128,010, filed Sep. 27, 1993, now U.S. Pat. No. 5,369,089.
Foreign Referenced Citations (4)
Number |
Date |
Country |
0356969 |
Mar 1990 |
EPX |
0357779 |
Mar 1990 |
EPX |
1-138167 |
May 1989 |
JPX |
2-247906 |
Oct 1990 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Mizuno et al, "Superconductivity of Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 Pb.sub.x O.sub.y (x=0.2, 0.4, 0.6)", Jpn. J. Appl. Phys. 27(7) Jul. 1988, pp. L1225-L1227. |
Kumakura et al, "Bi(Pb)-Sr-Ca-Cu-O Superconducting Composite Tapes Prepared by the Powder Method Using an Ag Sheath", J. Appl. Phys. 67(7) Apr. 1990, pp. 3443-3447. |
Mimura et al, "Improvement of the Critical Current Density of the Silver Sheathed Bi-Pb-Sr-Ca-Cu-O Superconducting Tape", Appl. Phys. Lett. 54(16), Apr. 1989, pp. 1582-1584. |
Continuations (1)
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Number |
Date |
Country |
Parent |
128010 |
Sep 1993 |
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